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Vitalii Martyniuk
Android Developer

About
Android Developer with 4+ years of commercial experience and proven leadership skills. I build maintainable, scalable,
and testable mobile apps, while leading and mentoring teams to deliver high-quality results.

Skills
General: Kotlin, Java, Android SDK, WebView, Clean Architecture, DI, XML, Jetpack Compose, Git, AI Agents.
Libraries: Dagger Hilt, Koin, Coroutines, Retrofit, OkHttp, Volley, Room, SQLite, OneSignal, Firebase, AppsFlyer,
FacebookSDK.
Design Patterns: MVI, MVVM, MVP.

Experience
Lead Android Developer Feb 2025 - Aug 2026
DEVILS
Work description: Promoted to Lead Android Developer due to my proactive approach and strong project involvement. Built
the Android team from scratch, conducting 25+ technical interviews and hiring skilled developers. Led a team of 5 Android
engineers. Provided onboarding and mentorship to ensure smooth integration into team workflows. Oversaw team direction,
performed code reviews, and continuously improved development processes to enhance productivity and code quality.
Team members: 5 Android Developers, 2 Backend Developers, 3 QA Engineers, 5 Designers.

Android Developer Jul 2023 - Feb 2025
DEVILS
Work description: Building android apps in a large team using various modern technologies. Proposed and successfully
implemented a new approach to development, which helped to make an app with 100,000+ downloads on Google Play.
Tools & Technologies: Kotlin, Java, Android SDK, WebView, Clean Architecture, Dependency Injection, XML, Jetpack
Compose, Git, Dagger Hilt, Koin, Coroutines, Retrofit, OkHttp, Volley, Room, SQLite, OneSignal, Firebase, LiveData,
AppsFlyer, FacebookSDK, MVI, MVVM, MVP.
Team members: 7 Android Developers, 2 Backend Developers, 3 QA Engineers, 5 Designers.

Android Developer May 2022 - Jun 2023
MOTR
Work description: Implementing a new design into a large game project for Android phones and tablets based on the PC
version of the game. Coordinated development efforts by leveraging Git for seamless collaboration.
Tools & Technologies: Java, Android SDK, Clean Architecture, Dependency Injection, XML, Git, SQLite.
Team members: 2 Android Developers, 1 QA Engineer.

Android Developer Nov 2021 - Feb 2022
Mozi
Work description: Creating an Android application from scratch for phones and TVs using the REST API. Implemented user
authentication and local database with saved movies. Ensured smooth teamwork by integrating changes and resolving
conflicts with Git.
Tools & Technologies: Java, Android SDK, XML, Git, OkHttp, SQLite, Firebase.
Team members: 1 Team Lead, 1 Android Developer, 1 Backend Developer.